XZR8®
Cyclone Transmission Corvette Servo Assembly 700R4 4L60E Red Cover
Cyclone Transmission Corvette Servo Assembly 700R4 4L60E Red Cover - Image 2
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Cyclone Transmission Corvette Servo Assembly 700R4 4L60E Red Cover


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3-Year Factory Warranty
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Transmission Compatibility700R4, 4L60, 4L60E, 4L65E, 4L70E
Model Year Range1982-2014
Actuator Type2-4 Intermediate Servo (Corvette Style / High Performance)
Boost Pressure RatingApprox. 50% over Standard OE Servo
Surface FinishRed Anodized / Painted Aluminum
Piston MaterialAluminum Alloy
Housing MaterialAluminum Alloy
Seal MaterialHigh-Temperature Viton / Rubber
Pin Type3-Ring Long Pin (1982-Up)
Installation MethodDrop-In, No Transmission Removal Required
Included ComponentsServo Piston, Cover, Snap Ring, O-Rings, Return Spring, Pin
Net Weight1.1 kg
Package Dimensions20 × 15 × 10 cm

Manufacturer No.

  • CT-700R4-CORVETTE-HD-RC
  • Corvette Servo HD Red Cover

OEM Part No.

  • 8654145
  • 24201132
  • A74905BK

Interchange No.

  • TransGo 7-2P
  • Sonnax 77911-03K
  • TCI 376003
  • Superior K51828C
  • Summit Racing SUM-705415-K

Fitment Vehicles

  • Chevrolet Corvette C4 (1984-1996)
  • Chevrolet Corvette C5 (1997-2004)
  • Chevrolet Camaro Z28 / SS (1982-2002)
  • Pontiac Firebird Trans Am (1982-2002)
  • Chevrolet C/K 1500 (1982-1999)
  • GMC Sierra 1500 (1988-2007)
  • Chevrolet Astro / GMC Safari (1990-2005)
  • Cadillac Fleetwood / Brougham (1982-1996)
This remanufactured 2-4 servo assembly utilizes the larger Corvette-style servo piston design to deliver approximately 50 percent more apply area than the standard OE servo found in most 700R4 and 4L60E units. The increased apply pressure firms up the 1-2 and 3-4 shift events, reducing clutch slip and heat generation under high torque conditions. The assembly is completely remanufactured by a professional transmission shop specializing in high-performance and heavy-duty applications. It includes a new Corvette-style aluminum piston, new seals (O-rings and D-rings), new return springs, and a painted red aluminum cover. The unit is a drop-in replacement requiring no transmission removal for installation on most GM rear-wheel-drive platforms. It is compatible with 700R4 (1982-1993), 4L60 (1990-1993), 4L60E (1993-2014), 4L65E, and 4L70E automatic transmissions. The servo bore dimensions and pin length correspond to the 3-ring long pin style used across the 1982-up model range.